Thermal response of photovoltaic cell to laser beam irradiation

This paper firstly presents the concept of using dual laser beam to irradiate the photovoltaic cell, so as to investigate the temperature dependency of the efficiency of long distance energy transmission. Next, the model on the multiple reflection and absorption of any monochromatic light in multilayer structure has been established, and the heat generation in photovoltaic cell has been interpreted in this work. Then, the finite element model has been set up to calculate the temperature of photovoltaic cell subjected to laser irradiation. Finally, the effect of temperature elevation on the efficiency and reliability of photovoltaic cell has been discussed to provide theoretical references for designing the light-electricity conversion system.Comment: Also appeared in the proceedings for "The Heat Transfer Symposium, Beijing, China, 6-9, May, 2014

Scalar field quasinormal frequencies of Reissner-Nordstr\"om black hole surrounded by quintessence by using he continued fraction method

We evaluate the quasinormal modes of massless scalar field around Reissner-Nordstr$\ddot{\text{o}}$m black hole surrounded by a static and spherically symmetric quintessence by using the continued fraction method. The appropriate Frobenius series for three special cases of the quintessence parameter $\epsilon = -1/3, -2/3$ and $-1$ are derived successfully. We show that the variation of quasinormal frequencies with charge of the black hole and the quintessential parameters. The numerical results show that quintessence field decreases oscillation frequencies of all angular momentum $l$ modes and increases the damping time of $l>0$ modes.Comment: 17 pages, 2 figure

Weighted projective lines of tubular type and equivariantization

We prove that the categories of coherent sheaves over weighted projective lines of tubular type are explicitly related to each other via the equivariantization with respect to certain cyclic group actions

Dynamical current-current correlation in the two-dimensional parabolic Dirac system

We theoretically investigate the current-current correlation of the two-dimensional (2D) parabolic Dirac system in hexogonal lattice. The analytical expressions of the random phase approximation (RPA) susceptibility, Ruderman-Kittel-Kasuya-Yosida (RKKY) Hamiltonian, and the diamagnetic orbital susceptibility in noninteracting case base on the density-density or current-current correlation function are derived and quantitatively analyzed. In noninteracting case, the dynamical polarization with- in RPA and spin transverse susceptibility as well as the RKKY interaction (when close to the half-filling) are related to the the current-current response in the 2D parabolic Dirac system. Both the case of anisotropic dispersion and isotropic dispersion are discussed

Accessible values of Assouad and the lower dimensions of subsets

Let $E$ be a subset of a doubling metric space $(X,d)$. We prove that for any $s\in [0, \dim_{A}E]$, where $\dim_{A}$ denotes the Assouad dimension, there exists a subset $F$ of $E$ such that $\dim_{A}F=s$. We also show that the same statement holds for the lower dimension $\dim_L$.Comment: 13 page

A note on Serre duality and equivariantization

For an abelian category with a Serre duality and a finite group action, we compute explicitly the Serre duality on the category of equivariant objects. Special cases and examples are discussed. In particular, an abelian category with a periodic Serre duality and its equivariantization are studied.Comment: Comments are welcome

Two-dimensional parabolic Dirac system in the presence of non-magnetic and magnetic impurities

We theoretically investigate the effect of the non-magnetic and magnetic impurities to the 2D parabolic Dirac system. The induced charge density by the charged impuri- ty is obtained by the linear response theory within the random phase approximation. We also detailly calculate the RKKY interaction between two magnetic impurities placed within the 2D sheet of the Dirac materials with isotropic and anisotropic dis- persion. For the anisotropic dispersion, the RKKY interaction is also anisotropic and related to the lattice parameters which can be obtained throuh the DFT calculation or the experiments. The fearures of the RKKY interaction also can be treated as a signature of the topological phase transition as well as the change of Berry curvature. Our results are also illuminating to the study of the static screening and the RKKY interaction of the isotropic or anisotropic 3D Dirac or Weyl systems

The singularity category of an algebra with radical square zero

To an artin algebra with radical square zero, a regular algebra in the sense of von Neumann and a family of invertible bimodules over the regular algebra are associated. These data describe completely, as a triangulated category, the singularity category of the artin algebra. A criterion on the Hom-finiteness of the singularity category is given in terms of the valued quiver of the artin algebra.Comment: Comments are welcom

Electronic transport and the related anomalous effects in silicene-like hexagonal lattice

We investigate the anomalous effects due to the Berry correction and the considerable perturbations in the silicene-like hexagonal lattice system. The Berry curvature in periodic Bloch band system which related to the electromagnetic field is explored, the induced transverse anomalous velocity gives rise to the intrinsic Hall conductivity (without the vertex correction) expecially in the quantum anomalous Hall phase. The quantum anomalous Hall effect which related to the anomalous velocity term is detected, including the band avoided corssing effect and the generated special band gap. %{Enlarged Galilean symmetry of anyons and the Hall effect} The topological spin transport is affected by the Berry curvature %{Topological spin transport of a relativistic electron} %{Anomalous direction for skyrmion bubble motion} and the spin-current-induced Skyrmion spin texture motion is contrasted between the quantum spin Hall effect and quantum anomalous Hall effect. Since silicene involving the orbital degree of freedom, the orbital magnetic moment and orbital magnetization contributes significantly to the electronic transport properties of silicene %{Photoinduced quantum spin and valley Hall effects, and orbital magnetization in monolayer MoS2} as explored in this article. We also investigate the electronic tunneling properties of silicene in Josephon junction with the electric-field-induced Rashba-coupling, the anomalous effect due to the Berry phase is mentioned. Our results is meaningful to the application of the spintronics and valleytronics base on the silicene-like topological insulators

Analysis of the behavior of singlet pairs in inorganic crystal XOCl(X=Ti,Bi)

This article explore the behavior of singlet pairs in Inorganic crystals and take the Ti-Ti and Bi-Bi dimer for example, including the transition in critical temperture by directly or indirectly. Through the analysis, It is proposed that with the decrease of temperature, the strength of spin-orbit coupling (SOC) increases and the phase difference also increases. In the one-dimensional spin 1/2 chain system of TiOCl and BiOCl crystals, the possibility of reversible parameter modulation is proposed by the calculation of the first principle analyzing the process and analysis of the structural phase transition process. It's shown that the different sturcture transition is relate to the difference of the dimer structure and the fluctuation of orbital order through the comparative study of TiOCl and BiOCl